7 W offline converter with 800 V avalanche-rugged MOSFET
The STMicroelectronics VIPER013LSTR is an offline switching regulator that integrates an 800 V avalanche-rugged power MOSFET and a PWM controller in a single 10-SOP package.
Fixed 60 kHz switching — transformer sizing is locked
The switching frequency is fixed at 60 kHz, which sets the transformer or inductor core size and the EMI filter corner. There is no frequency foldback or spread-spectrum; the design must accommodate the fundamental and its harmonics in the conducted emissions band. The 80 % maximum duty cycle supports a wide input-to-output voltage ratio in buck-boost and flyback configurations, useful for universal AC input (85–265 VAC) designs where the bulk capacitor voltage can swing from 120 V to 375 V.
Junction temperature headroom for hot enclosures
The 150 °C Tj(max) rating means the thermal shutdown threshold is above the operating limit, so the part can ride through transient overloads without immediate shutdown.
Integrated protection set reduces BOM count
On-chip fault protection covers current limiting, over-temperature, over-voltage, and short-circuit. The output isolation is configurable as either isolated or non-isolated, so the same part can serve a flyback with an optocoupler or a simple buck converter.